【objective-c】AppDelegateからViewを描写する方法

Question

本当に初歩的なことすぎて、すいません。
シングルビューでviewを表示する方法がわかりません。

ストリーボードを使いたくないので
消すと画面との紐付けがなくなり表示されなくなります。
コードから呼び出したいのですが、どう書けばいいでしょうか。

@property (strong, nonatomic) UIViewController *viewController; // 追加
このプロパティと二つのファイル（ViewController.h、ViewController.m）が
紐付いてないような感触があるのですが何故でしょうか。。

【AppDelegate.h】
#import <UIKit/UIKit.h>
#import "ViewController.h"

@interface AppDelegate : UIResponder <UIApplicationDelegate>

@property (strong, nonatomic) UIWindow *window;
@property (strong, nonatomic) UIViewController *viewController; // 追加

@end

【AppDelegate.m】

#import "AppDelegate.h"

@interface AppDelegate ()

@end

@implementation AppDelegate

@synthesize window;

• (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
  // Override point for customization after application launch.

  // ここから
  self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
  self.viewController = [[UIViewController alloc] init];
  self.window.rootViewController = self.viewController;
  [self.window makeKeyAndVisible];
  // ここまでを追加

  return YES;

}

• (void)applicationWillResignActive:(UIApplication *)application {
  // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
  // Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.

}

• (void)applicationDidEnterBackground:(UIApplication *)application {
  // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
  // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.

}

• (void)applicationWillEnterForeground:(UIApplication *)application {
  // Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.

}

• (void)applicationDidBecomeActive:(UIApplication *)application {
  // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.

}

• (void)applicationWillTerminate:(UIApplication *)application {
  // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.

}

@end

【ViewController.h】
#import <UIKit/UIKit.h>

@interface ViewController : UIViewController

@end

【ViewController.m】
#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

• (void)viewDidLoad {
  [super viewDidLoad];
  // Do any additional setup after loading the view, typically from a nib.

}

• (void)didReceiveMemoryWarning {
  [super didReceiveMemoryWarning];
  // Dispose of any resources that can be recreated.

}

@end

Answer 1

すいません。
解決しました。
失礼いたしました。

• (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
  // Override point for customization after application launch.

  // create window
  self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

  // Override point for customization after application launch.
  self.window.backgroundColor = [UIColor whiteColor];

  _viewController = [[ViewController alloc] init];
  [self.window addSubview:_viewController.view];

  // 初期状態としてViewController1を前面に表示する。
  [self.window bringSubviewToFront:_viewController.view];

  [self.window makeKeyAndVisible];

  return YES;

}